I could not disagree more. If you say "Ben told Mary that he would work with Scott on Jeff's house on Tuesday, but that Amy preferred Wednesday", that sentence carries a lot of meaning for the speaker and listener because those "names" have meaning to both parties. Nobody would tolerate the descriptive alternative: "General Contracting Company Owner told General Contracting Company Secretary that he would work with General Contracting Company Hired Hand #4 on Customer #22's house on Tuesday but Customer #22 Spouse preferred Wednesday".